地下厂房围岩松弛区的应变软化参数研究及应用  

Research and Application of Strain Softening Parameters in the Relaxation Zone of Underground Powerhouse Surrounding Rock

作　　者：张莹 狄圣杰 孙春华[1] 陆希[1] ZHANG Ying;DI Shengjie;SUN Chunhua;LU Xi(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;High Slope and Geological Hazard Research and Management Sub-center,National Energy and Hydropower Engineering Technology Research and Development Center,Xi'an 710065,China;State Key Laboratory of Ecological Water Resources in Northwest Arid Region,Xi'an 710065,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]国家能源水电工程技术研发中心高边坡与地质灾害研究治理分中心,西安710065 [3]西北旱区生态水利国家重点实验室西北院分室,西安710065

出　　处：《西北水电》2022年第6期98-103,共6页Northwest Hydropower

摘　　要：通过引入扰动评价因子,考虑地质强度指标GSI、岩体质量指数Q、岩体分类指标RMR等因素,改进了Hoek-Brown岩体强度准则估算岩体强度及变参数公式,以某抽水蓄能电站地下洞室工程为研究对象,综合分析了研究地下洞室区域的工程地质资料,基于洞室开挖先期纵波测试数据,计算得到应变软化模型松弛围岩的强度及变形参数,对比计算结果与现场实际监测资料,结果表明:考虑围岩松弛的应变软化模型计算结果与监测资料基本一致,结果可信,可对后续开挖支护及围岩稳定反馈分析提供参考。By introducing disturbance evaluation factors,considering factors such as geological strength index GSI,rock mass quality index Q,rock mass classification index RMR,etc.,the Hoek-Brown rock mass strength criterion is improved to estimate rock mass strength and variable parameter formulas.Taking the underground powerhouse of a pumped storage power station as the research object,the engineering geological data of the underground powerhouse area is comprehensively analyzed.Based on the preliminary longitudinal wave test data of the powerhouse excavation,the strength and deformation parameters of the relaxed surrounding rock of the strain softening model are calculated.The calculation results are compared with the actual monitoring data on site.The results show that the calculation results of the strain softening model considering the relaxation of surrounding rock are basically consistent with the monitoring data,the results are scientific and credible which can provide reference for following excavation and support as well as response analysis of surrounding rock stability.

关 键 词：地下洞室 应变软化 围岩松弛 开挖松弛 围岩稳定 

分 类 号：TV731.6[水利工程—水利水电工程]